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Influence of Forest Structure on Wildfire Behavior and the Severity

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Influence of Forest Structure on Wildfire Behavior and the Severity United States Department of Influence of Forest Agriculture Forest Structure on Wildfire Service November 2003 Behavior and the Severity of Its Effects An Overview and 2002: weather, an abundance of fuel (combustible forest materials), lack of moisture, and terrain characteristics. Of these four factors, only fuel abundance can be directly influenced through human intervention; however, the treatments to reduce fuels can significantly modify fire behavior and severity and reduce environmental damage caused by fire. Excluding fire from the natural cycle has resulted in a buildup of flammable plant materials across large areas of the forest landscape. As forest fuels accumulate, the forest structure changes, leading to greater continuity of fuels between the ground surface and the upper tree canopies. This altered structure provides “ladders” for wildfire to climb up into the tree tops. Where trees are densely packed, the fire can spread from tree to tree in a phenomenon known as crown fire or crowning. Crown fires are intense and fast- moving. They can threaten communities and damage key resources, including timber, fish and wildlife habitat, soils, and drinking water quality. Crown fires are virtually unstoppable, and often result in large burned areas despite costly and dangerous fire suppression efforts. Wildland fire flames of the Monument Fire, OR, 2002. The effects of decreased fire occurrence on fuels and fire behavior vary from site to site. In the Introduction Western United States, the effects are most pronounced in arid to semiarid forests dominated The year 2002 was the second largest fire season by ponderosa pine, Douglas-fir, or a combination in almost 50 years. Four States had the largest of the two. Historically, these ecosystems areas burned in wildfire since at least the early experienced frequent fires, which typically burned 1900s—Arizona, Colorado, New Mexico, and at low intensity in surface fuels, with only Oregon. California wasn’t far behind. Across the occasional damage to overstory trees. Removing Nation, almost as many acres burned in 2002 as in 2000, when the area burned was twice the 10-year average. The 2002 season could have been much worse. The Forest Service and its partners in the firefighting community controlled 99 percent of the wildland fires during initial attack. The fires that did escape initial attack threatened life and property, compromised municipal watersheds, and damaged ecosystems—many of which will take decades to recover. Fire suppression expenditures for 2002 were $1.4 billion. More than 90 years of fire research shows that Grazing reduces surface fuels, which, in turn, decreases four factors working in concert can result in the the incidence of wildland fire. type of catastrophic wildfires witnessed in 2000 1 and decrease the likelihood of tree mortality from stem scorching and root damage. Surface fuel reduction also diminishes a fire’s heat, a key factor in the initiation of crown fires. Thinnings designed to reduce crown density helps prevent tree crowns from severe, often fatal, burns. Reducing crown density also decreases the likelihood of a sustained crown fire moving through the forest, even if crown ignitions do occur. Proactive, ecosystem-based land management can improve and maintain forest health while reducing the danger of catastrophic fire in these arid and semi-arid western forests. However, the forest health and fire hazard problems arising from fire exclusion took decades to develop and the solution will not happen overnight. The remainder of this overview presents highlights of available scientific information and implications for management action. fire from the natural cycle has resulted in overcrowded stands with dense canopies and many Influence of Forest Structure small trees of shade-tolerant and less fire-resistant on Wildland Fire Behavior and Effects species growing between a few large trees. This type of overall forest structure increases the A forest stand may consist of several layers of probability that a low-burning surface fire will live and dead vegetation in the understory, develop into a high-intensity crown fire. The midstory, and overstory—or surface, ladder, and overly dense forest structure also means that trees crown fuels. are in stressful competition and more susceptible Surface fuels consist of grasses, shrubs, litter, to disease, insects, and invasive species. and woody material lying on the ground. Surface Wildland fires differ greatly in severity, which fires burn low vegetation, woody debris, and litter. refers to the degree of impact on soils, vegetation, Under the right conditions, surface fires reduce the and other ecosystem components. Weather, forest likelihood that future wildfires will grow into structure, fuel condition, and vegetation crown fires. composition interact with location to determine a Ladder fuels consist of live and dead small fire’s severity. Land managers can design fuel trees and shrubs, live and dead lower branches treatments to alter forest structure and influence from larger trees, needles, vines, lichens, mosses, fire behavior and burn severity. Treatments that and any other combustible biomass located reduce surface fuels tend to reduce damage to soils Historical Present Hypothetical simulation of changes in vertical arrangement and horizontal continuity in forest stand structure. Today’s forests are more spatially uniform, with higher densities of fire-intolerant species and suppressed trees. 2 between the top of the surface fuels and the bottom of the overstory tree crowns. Crown fuels are suspended above the ground in treetops or other vegetation and consist mostly of live and dead fine material. When historically low- density forests become overcrowded, tree crowns may merge and form a closed canopy. Tree canopies are the primary fuel layer in a forest crown fire. Fire behavior is strongly influenced by surface, ladder, and crown fuels. Heavy ladder and crown fuels enable fires to climb upward into the crowns Hayman Fire, June 15, 2002, about 9 p.m. Photo by and help to sustain crown fires once they are Steven Smith, Colorado Springs Fire Department. started. Rapidly moving crown fires typically consume nearly all the fine fuels in a forest canopy easily suppressed surface fire when the when wind and a sloping topography are thrown Hayman Fire burned into the area. into the mix. Crown fires caused by excessive fuel ➢ On the other hand, all trees were killed in the accumulation are generally a severe threat to Sheepnose Fuels Reduction Project. ecological and human values and to infrastructure Although removing smaller trees dramatically and are a major challenge for fire management. reduced stand density, large amounts of Such fires kill large numbers of trees, damage surface fuels allowed the fire to burn soils, increase erosion, impair air quality, and can intensely through the stand. degrade or destroy species habitat. Thinning opens stands to greater solar radiation and wind movement, resulting in warmer Fuel Treatments Can Influence Fire temperatures and drier fuels throughout the fire Behavior and Reduce Fire Severity season. While this openness can encourage a surface fire to spread, such fires do little ecological Where forests are overcrowded, the most damage. Where human values are threatened, these effective strategy for reducing fire risks is to design types of low-intensity fires are relatively easy to treatments to decrease fuels in all three strata. control and less likely to support a crown fire even Thinning reduces the flammability in the midstory under severe weather conditions. and overstory, while treating surface fuels, Mechanical thinning, especially when directed at including those resulting from thinning, decreases the smaller and medium-sized trees, can be quite surface fire potential. effective in reducing the conditions conducive to Three recent examples from the Hayman Fire in crown fire spread. However, thinning is most Colorado illustrate the relation between surface, effective when followed by additional treatments crown and ladder fuels, and fire behavior. such as prescribed fire to reduce surface fuels. If ➢ The Polhemus prescribed burn in November thinning is used, it is important to reduce the fine 2001 removed most surface fuel and pruned fuels, such as small branches, leaves and needles, lower live branches from trees in a ponderosa or they will add to surface fire potential. Branches, pine forest, while maintaining a desirable limbs, and other slash may need to be treated with overstory density. These changes were prescribed fire. sufficient to stop the Hayman Fire when it Piling and burning the slash and other material burned into the area in June 2002. is an effective way to treat it. If burning is not ➢ On the Manitou Experimental Forest, acceptable due to smoke production, the residual mechanical thinning reduced density in a fuel can be removed from the site. pure pine forest and concentrated logging Prescribed fire is one of the most effective slash in large piles within the Trout Creek means to remove surface fuels and reduce Timber Sale. These actions resulted in an understory density. Prescribed burning affects 3 Site before thinning. During thinning operation. implementation has been guided by hundreds of scientific investigations and years of professional experience. When properly conducted with safeguards developed from experience, past research, and emerging scientific findings, these practices can be combined in a treatment regime to improve
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